gobject:value-init (gvalue &optional gtype)

gvalue -- an uninitialized g:value instance
gtype -- an optional g:type-t type ID the gvalue argument should hold values of, or the default nil value

The g:value instance that has been passed in.

Sets gvalue to zero and initializes it with the gtype type. If the gtype argument is nil, the gvalue argument is set to zero but not initialized.